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Loans and Leases - Components (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Loans and leases      
Loans and leases $ 12,961,999 $ 13,279,097 $ 13,211,650
Outstanding loan balances, deferred loan costs and fees 42,200 26,100  
Accrued interest receivable related to loans and leases recorded separately 49,000 59,000  
Residential real estate loans pledged to collateralize the borrowing capacity at the FHLB 2,400,000 2,900,000  
Consumer, commercial and industrial, commercial real estate and residential real estate loans pledged to collateralize the borrowing capacity at the FRB 1,700,000 1,900,000  
Real estate      
Loans and leases      
Loans and leases 4,959,975 4,531,842  
Commercial and Industrial      
Loans and leases      
Loans and leases 2,087,099 3,019,507 2,743,242
Commercial and Industrial | Real estate      
Loans and leases      
Loans and leases 2,087,099 3,019,507  
Commercial real estate      
Loans and leases      
Loans and leases 3,639,623 3,392,676 3,463,953
Commercial real estate | Real estate      
Loans and leases      
Loans and leases 3,639,623 3,392,676  
Construction      
Loans and leases      
Loans and leases 813,969 735,819 519,241
Construction | Real estate      
Loans and leases      
Loans and leases 813,969 735,819  
Residential Mortgage      
Loans and leases      
Loans and leases 4,083,367 3,690,218 4,662,175
Properties in the process of foreclosure 4,700 2,300  
Residential Mortgage | Real estate      
Loans and leases      
Loans and leases 4,083,367 3,690,218  
Home equity Line      
Loans and leases      
Loans and leases 876,608 841,624  
Home equity Line | Real estate      
Loans and leases      
Loans and leases 876,608 841,624  
Consumer      
Loans and leases      
Loans and leases 1,229,939 1,353,842 1,620,556
Consumer | Real estate      
Loans and leases      
Loans and leases 1,229,939 1,353,842  
Lease financing      
Loans and leases      
Loans and leases 231,394 245,411 $ 202,483
Home Equity Loans and Lines of Credit      
Loans and leases      
Loans and leases 876,608    
Commercial Lending      
Loans and leases      
Loans and leases 6,772,085 7,393,413  
Residential mortgage      
Loans and leases      
Loans and leases $ 4,083,367 3,690,218  
Home equity      
Loans and leases      
Loans and leases   841,624  
Home equity | Residential Mortgage      
Loans and leases      
Loans and leases   $ 4,531,842